Aerosol Generation Device with Reduced Spitting Effect

ABSTRACT

An aerosol generation device includes a reservoir storing an aerosol-forming liquid having first and second mixed compounds having first and second boiling points, a heater for vaporizing the aerosol-forming liquid mixed with air in an aerosol chamber to generate an aerosol, a power source storing electrical energy, and a controller arranged, during each inhalation phase of a vaping session, for controlling supply of electrical power to the heater according to a chosen profile in which the electrical power varies over time depending on the first and second boiling points in order to control a vaporization ratio of the first and second compounds in the aerosol chamber.

FIELD OF THE INVENTION

The present invention relates to aerosol generation devices, and more precisely to the control of the composition of the aerosols that are generated by such aerosol generation devices during vaping sessions.

BACKGROUND

The invention concerns the aerosol generation devices often named “E-vapor devices” and comprising:

a reservoir storing an aerosol-forming liquid comprising at least first and second mixed compounds having respectively first and second boiling points, a heater for vaporizing the aerosol-forming liquid mixed with air in an aerosol chamber to generate an aerosol, a power source, possibly a rechargeable battery, storing electrical energy, and a controller (or control device) arranged for controlling the supply of electrical power to the heater during each inhalation phase (or puff) of a vaping session.

Some aerosol-forming liquids comprises at least first and second mixed compounds having respectively first and second boiling points. This is notably the case for those comprising Propylene Glycol (PG) and Vegetable Glycerin/Glycerol (VG) with different ratios. It is recalled that propylene glycol has a first boiling point between 185° C. and 189° C., while vegetable glycerin/glycerol has a second boiling point around 290° C.

When the coil of the heater heats the compounds (or components) of the aerosol-forming liquid, these compounds can dissociate and the liquid with the lower boiling point can vaporise at a faster rate, which causes a build up of the component with the higher boiling point. A first part of the aerosol-forming liquid (or “e-liquid”) with the highest concentration of first compound (for instance PG) is located in the center of the heating area (generally a wick) surrounded by the heating element(s) of the heater, while a second part of the aerosol-forming liquid with the highest concentration of second compound (for instance VG) is located at the periphery of the heating area near the heating element(s). When some new aerosol-forming liquid is introduced into the heating area, the first compound (PG) newly introduced is heated above its first boiling point due to latent heat in the areas comprising a high concentration of hot and vaporized second compound (VG) and also due to the role of the heat capacity (i.e. if the VG build up is too much the temperature at the coil goes above the boiling point of PG, as does the VG rich area of the wick—this is what allows vaporisation of PG at the centre of the wick and thus bubbles of vapor forcing their way out from the centre and taking hot second compound rich liquid droplets with them, with symptoms such as cracks, pops, crackles). So, unwanted droplets of e-liquid that have not been completely vaporized reach the lips and/or mouth of the user during a puff, which may be unpleasant and therefore has a negative impact on the user experience. The generation of these unwanted e-liquid droplets is sometimes call “spitting effect”. Since this spitting effect has a randomised occurrence it causes variability of aerosol delivery.

To reduce the spitting effect it has been proposed to modify the heating area and/or the heater characteristics. For instance, it is possible to reduce the wick thickness inside the heater and/or to replace the wound coil of the heater with ceramic. But this induces a cost increase. It has been also proposed to place filter(s) and/or baffle(s) in the aerosol path to capture the generated e-liquid droplets (of the spitting effect). But this induces not only a cost increase, but also an increasing complexity of the internal architecture.

Therefore, an object of this invention is to improve the situation, and notably to allow decreasing the spitting effect without inducing a noticeable cost increase or an increasing complexity of the internal architecture.

SUMMARY OF THE INVENTION

The proposed invention provides notably an embodiment of an aerosol generation device comprising:

a reservoir storing an aerosol-forming liquid comprising at least first and second mixed compounds having respectively first and second boiling points, a heater for vaporizing the aerosol-forming liquid mixed with air in an aerosol chamber to generate an aerosol, a power source storing electrical energy, and a controller arranged for controlling supply of electrical power to the heater during each inhalation phase of a vaping session.

This aerosol generation device is characterized in that its controller is arranged for controlling this supply according to a chosen profile in which the electrical power varies over time depending on the first and second boiling points in order to control a vaporization ratio of the first and second compounds in the aerosol chamber.

Thanks to the invention, the control of the level of the electrical power and of the duration at such a level allows to control the vaporization ratio of the first and second compounds, and therefore the ratio of vapor bubbles (rich of first compound) over unvaporized liquid droplets (rich of second compound) in the heating area, which allows reducing the spitting effect.

The embodiment of an aerosol generation device may comprise other aspects or features, considered separately or combined, as defined hereafter:

-   -   the controller may be arranged for controlling the supply         according to a chosen profile that allows minimizing the         vaporization ratio of the first and second compounds in the         aerosol chamber;     -   in a first example of embodiment the controller may be arranged         for controlling the supply according to a chosen profile         comprising a first phase having a first duration at a first         electrical power, a second phase having a second duration at a         second electrical power greater than this first electrical         power, and a third phase having a third duration at a third         electrical power greater than this second electrical power;     -   in this first example of embodiment the first, second and third         durations may be equal to a chosen first value. For instance,         this chosen first value may be comprised between 150 ms and 250         ms;     -   in a second example of embodiment the controller may be arranged         for controlling the supply according to a chosen profile         comprising a first phase having a first duration at a first         electrical power, a second phase having a second duration at an         electrical power equal to zero, a third phase having a third         duration at this first electrical power, a fourth phase having a         fourth duration at an electrical power equal to zero, and a         fifth phase having a fifth duration at this first electrical         power;     -   in this second example of embodiment the first, third and fifth         durations may be equal to a chosen second value. For instance,         this chosen second value may be comprised between 70 ms and 130         ms;     -   also in this second example of embodiment the second and fourth         durations may be equal to a chosen third value. For instance,         this chosen third value may be comprised between 10 ms and 50         ms;     -   in a third example of embodiment the controller may be arranged         for controlling the supply according to a chosen profile         comprising a phase having a chosen duration during which the         electrical power strictly increases;     -   in this third example of embodiment the controller may be         arranged for controlling the supply according to a chosen         profile comprising a phase during which the electrical power         varies as a logarithmic function;     -   also in this third example of embodiment the chosen duration may         be comprised between 550 ms and 650 ms;     -   the power source may be a rechargeable battery;     -   the aerosol generation device may constitute an electronic         cigarette (or e-cigarette).

The proposed invention provides also an embodiment of a method intended for controlling aerosol generation by an aerosol generation device comprising:

a reservoir storing an aerosol-forming liquid comprising at least first and second mixed compounds having respectively first and second boiling points, a heater for vaporizing this aerosol-forming liquid mixed with air in an aerosol chamber to generate an aerosol, a power source storing electrical energy, and a controller arranged for controlling supply of electrical power to the heater during each inhalation phase of a vaping session.

This method is characterized in that it comprises a step in which the controller controls the supply according to a chosen profile in which the electrical power varies over time depending on the first and second boiling points in order to control a vaporization ratio of the first and second compounds in the aerosol chamber.

BRIEF DESCRIPTION OF THE FIGURES

The invention and its advantages will be better understood upon reading the following detailed description, which is given solely by way of non-limiting examples and which is made with reference to the appended drawings, in which :

FIG. 1 schematically illustrates an example of embodiment of an electrical and control device of an aerosol generation device according to the invention,

FIG. 2 schematically illustrates an example of embodiment of a cartomizer intended for being coupled to the electrical and control device of FIG. 1 to define an aerosol generation device according to the invention,

FIG. 3 schematically illustrates in a diagram a first example of temporal evolutions of the temperatures (T (in ° C.)) of the first compound (curve c1) and second compound (curve c2) in the presence of a first chosen electrical power profile (curve c3-ep (in Watt)),

FIG. 4 schematically illustrates in a diagram a second example of temporal evolutions of the temperatures (T (in ° C.)) of the first compound (curve c1) and second compound (curve c2) in the presence of a second chosen electrical power profile (curve c3-ep (in Watt)), and

FIG. 5 schematically illustrates in a diagram a third example of temporal evolutions of the temperatures (T (in ° C.)) of the first compound (curve c1) and second compound (curve c2) in the presence of a third chosen electrical power profile (curve c3-ep (in Watt)).

DETAILED DESCRIPTION OF EMBODIMENTS

The invention aims, notably, at proposing an aerosol generation device (or E-vapor device) 1, comprising a cartomizer 2 (comprising an aerosol-forming liquid comprising at least first and second mixed compounds having respectively first bp1 and second bp2 boiling points) and an electrical and control device 3, and subjected to a reduced spitting effect.

In the following description it will be considered that the aerosol generation device 1 is an electronic cigarette (or e-cigarette or else personal vaporizer). But an aerosol generation device 1 according to the invention could be of another type, as soon as it allows the generation of an aerosol by heating an aerosol-forming liquid (or e-liquid). So, for instance, the aerosol generation device 1 could be an inhaler.

Moreover, in the following description it will be considered that the aerosol-forming liquid comprises at least propylene glycol (or PG—first compound with a first boiling point bp1 between 185° C. and 189° C.) and vegetable glycerin/glycerol (or VG—second compound with a second boiling point bp2 around 290° C.). But the aerosol-forming liquid may comprise one or more of nicotinoid(s), cannabinoid(s), caffeine, tobacco material, organic acids, salts, flavoring, and combinations thereof, and a carrier (e.g. a liquid solvent) which may include propylene glycol, glycerin/glycerol, trimethylene glycol, water, ethanol, and combinations thereof.

Furthermore, in the following description the term “aerosol” may include a suspension of substance as one or more of solid particles, liquid droplets and gas. Such a suspension may be in a gas including air.

As illustrated partially in FIGS. 1 and 2 , an aerosol generation device 1, according to the invention, comprises at least a reservoir 5, a heater 18, an aerosol chamber 7, a power source 23 and a controller 27.

For instance, and as illustrated in the non-limiting example of FIGS. 1 and 2 , the reservoir 5, the heater 18 and the aerosol chamber 7 may be part of a cartomizer 2 (possibly exchangeable and illustrated in FIG. 1 ), while the power source 23 and the controller 27 may be part of an electrical and control device 3 (illustrated in FIG. 2 ). In this embodiment, the electrical and control device 3 and the cartomizer 2 are intended to be physically and electrically coupled together.

As illustrated in FIG. 2 the cartomizer 2 may comprise a body 4 comprising the reservoir 5, the heater 18, an aerosol chamber 7, at least one first air inlet 11 and at least one aerosol outlet 16.

The reservoir 5 is arranged for storing an aerosol-forming liquid (or e-liquid) comprising at least first and second mixed compounds having respectively first bp1 and second bp2 boiling points.

The heater 18 is arranged for vaporizing (or aerosolizing) the aerosol-forming liquid mixed with air in the aerosol chamber 7 in order to generate an aerosol.

The (each) first air inlet 11 is set upstream the aerosol chamber 7 and in fluid communication therewith, in order to supply it with air originating from outside.

The (each) aerosol outlet 16 is set downstream the aerosol chamber 7 and in fluid communication therewith, in order to receive the generated aerosol when a user of the aerosol generation device 1 inhales during a vaping session.

For instance, and as illustrated in the non-limiting example of FIG. 2 , the cartomizer body 4 may comprise an internal wall 6 defining the aerosol chamber 7. Also for instance, this internal wall 6 may have an annular shape. The aerosol chamber 7 is fed with air (sucked in by the user) through each first air inlet 11 defined in the internal wall 6 (as illustrated by the two small arrows B in FIG. 2 ). This air comes from outside through at least one second air inlet 12 defined in the body 4 (as illustrated by the arrow C in FIG. 2 ). But, each second air inlet 12 could be defined in a wall of the body 13 of the electrical and control device 3.

Also for instance, and as illustrated in the non-limiting example of FIG. 2 , the cartomizer body 4 may comprise a mouthpiece 8 comprising the (each) aerosol outlet 16 and allowing the user to inhale the generated aerosol through this aerosol outlet 16 during a vaping session (as illustrated by the arrows A in FIG. 2 ). In this case, the aerosol chamber 7 is fluidly coupled to the mouthpiece 8 by a central conduit (or passage) 9 leading to the aerosol outlet 16. Also for instance, the mouthpiece 8 may be integral with an end 10 of the cartomizer body 4 that receives the generated aerosol from the central conduit 9. But this mouthpiece 8 could be an additional part coupled to the cartomizer body 4.

Also for instance, and as illustrated in the non-limiting example of FIG. 2 , the cartomizer body 4 may comprise an outer wall 17 defining a cavity, and the reservoir 5 may be delimited at least partially by this outer wall 17 and the central conduit 9.

In the illustrated example, the aerosol chamber 7 comprises the heater 18 that is arranged for heating the aerosol-forming liquid (originating from the reservoir 5) to generate the aerosol, when it receives electrical power (or energy) originating from the power source 23 of the electrical and control device 3. This heater 18 may be a resistive heater, such as a resistive coil, and/or an inductive heater, such as a metallic susceptor. In this case, the heater 18 may comprise one or more electrically activated resistive and/or inductive heating elements. The heating can be made by conduction, convection and/or radiation.

For instance, the aerosol-forming liquid can leave the reservoir 5 to reach the aerosol chamber 7 (see the four arrows D) through openings 15 defined in the internal wall 6.

Also for instance, and as illustrated in the non-limiting example of FIG. 2 , the reservoir 5 may have an annular shape and a central passage defining the central conduit (or aerosol passage) 9.

Also for instance, and as illustrated in the non-limiting example of FIG. 1 , the body 13 of the electrical and control device 3 may define a housing 26 intended for receiving a part of the cartomizer body 4.

Also for instance, and as illustrated in the non-limiting example of FIGS. 1 and 2 , the coupling between the cartomizer body 4 and the body 13 of the electrical and control device 3 can be done by permanent magnets 24 that may be located in the housing 26 and intended for attracting corresponding elements 25 of the cartomizer body 4. But in a variant of embodiment not illustrated, the coupling between the cartomizer body 4 and the body 13 of the electrical and control device 3 could be done by screwing by means of corresponding threaded portions, for instance.

As illustrated in FIG. 1 the body 13 of the electrical and control device 3 may comprise at least the controller (or control device) 27 and a possible user interface 28 in addition to the power source 23 (storing electrical energy).

For instance, the power source 23 may be a rechargeable battery. In this case the body 13 may comprise an electrical connector to which a charger cable may be connected during a charging session of the rechargeable battery 23. Such a charger cable may be coupled to an (AC) adapter or to a wall socket.

The controller 27 is electrically coupled to the power source 23 and controls the operation of the cartomizer 2 (and notably its heater 18) during a vaping session and also during a possible charging session. For instance, and as illustrated in the non-limiting example of FIG. 1 , the controller 27 may be fixed onto a printed circuit board 29 (housed in the body 13).

Explicit use of the term “controller” should not be construed to refer exclusively to hardware capable of executing software, and may implicitly include, without limitation, digital signal processor (DSP) hardware, processor, application specific integrated circuit (ASIC), field programmable gate array (FPGA), read only memory (ROM) for storing software, random access memory (RAM), and non volatile storage. Other hardware, conventional and/or custom, may also be included. The functions of the controller 27 may be carried out through the operation of program logic, through dedicated logic, through the interaction of program control and dedicated logic, or even manually (by the user). These functions may be provided through the use of dedicated hardware as well as hardware capable of executing software in association with appropriate software.

The possible user interface 28 is coupled to the controller 27 and the power source 23 to allow the user to control at least partly the controller 27. For instance, the user interface 28 may comprise a display (such as a screen or light emitting diode (or LED)-type interface) arranged for displaying information relative to a current vaping session or a possible current charging session and for allowing the user to control the controller 27. Also for instance, and as illustrated in the non-limiting example of FIG. 1 , the user interface 28 may be fixed partly to the printed circuit board 29 to ease and simplify its connections with the controller 27.

Also for instance, the cartomizer 2 and the electrical and control device 3 may comprise respectively electrical pins intended for contacting each other during their coupling to allow the feeding of the heater 18 with electrical power (or energy) during a vaping session.

Also for instance, and as illustrated in the non-limiting example of FIG. 2 , the aerosol chamber 7 may comprise an aerosol-forming liquid transport element 33 to transport aerosol-forming liquid from the openings 15 of the internal wall 6 to the heater 18. For instance, this aerosol-forming liquid transport element 33 may be a capillary element (possibly a capillary wick) having two opposite ends set in front of the openings 15, and possibly against the latter (and therefore against the internal surface of the internal wall 6). But in a variant of embodiment not illustrated, the aerosol-forming liquid transport element 33 may traverse two large openings (larger than those referenced 15) and defined in the internal wall 6 to finish in the reservoir 5. These large openings may seal the aerosol-forming liquid transport element 33 at its circumference to avoid by-pass of liquid around it. The capillary element 33 can be a fiber or ceramic rod, for instance. For instance, the heater 18 may comprise a resistive coil wound around the capillary element 33 and connected to internal electrodes via lead wires. In this case the windings of the heater 18 define a heating area comprising at least a part of the capillary element 33 and in which the aerosol-forming liquid (to be heated and originating from the reservoir 5) is introduced.

According to the invention, the controller 27 is arranged for controlling supply of electrical power (ep) to the heater 18, during each inhalation phase of a vaping session, according to a chosen electrical power profile. More precisely, in this chosen profile the electrical power varies over time depending on the first bp1 and second bp2 boiling points in order to control the vaporization ratio of the first and second compounds in the aerosol chamber 7 (and more particularly in the heating area).

It should be understood that the control of the level of the electrical power and of the duration at such a level allows to control the vaporization ratio of the first and second compounds when taking also into account the difference between the boiling points of these first and second compounds. So, the profile depends on the first and second compounds, and allows reducing the spitting effect since the vaporization ratio, and therefore the ratio of vapor bubbles (rich of first compound) over unvaporized liquid droplets (rich of second compound) in the heating area, can be now controlled.

Preferably, the controller 27 is arranged for controlling the supply of the heater 18 according to a chosen profile that allows minimizing the vaporization ratio of the first and second compounds in the aerosol chamber 7.

In a first example of embodiment illustrated non-limitatively in FIG. 3 , the controller 27 may be arranged for controlling the supply of the heater 18 according to a chosen profile comprising three successive phases. The first phase p11 has a first duration d11 at a first electrical power ep11. The second phase p12 has a second duration d12 at a second electrical power ep12 greater than the first electrical power ep11. The third phase p13 has a third duration d13 at a third electrical power ep13 greater than the second electrical power ep12. For instance, the first electrical power ep11 corresponds to a low power, the second electrical power ep12 corresponds to a medium power, and the third electrical power ep13 corresponds to a high power.

This first example of embodiment allows minimization of the temperature rise difference to achieve a reduction of the vaporization ratio vr1 and therefore of the spitting effect.

Also for instance, and as illustrated in FIG. 3 , in this first example of embodiment the first d11, second d12 and third d13 durations may be equal to a chosen first value v1. But they could be different one from the other.

Also for instance, in this first example of embodiment the chosen first value v1 may be comprised between 150 ms and 250 ms. As an illustrative example, well adapted to the case where the first and second compounds are respectively propylene glycol and vegetable glycerin/glycerol, the chosen first value v1 may be equal to 200 ms. But other first values v1 may be used, preferably as long as the sum of the first d11, second d12 and third d13 durations remains smaller or equal to the duration of a “standard puff” (which is generally considered equal to 3 s).

In a second example of embodiment illustrated non-limitatively in FIG. 4 , the controller 27 may be arranged for controlling the supply of the heater 18 according to a chosen profile comprising five successive phases. The first phase p21 has a first duration d21 at a first electrical power ep13. The second phase p22 has a second duration d22 at an electrical power equal to zero. The third phase p23 has a third duration d23 at the first electrical power ep13. The fourth phase p24 has a fourth duration d24 at an electrical power equal to zero. The fifth phase p25 has a fifth duration d25 at the first electrical power ep13. For instance, the first electrical power ep13 corresponds to a high power.

This second example of embodiment allows reducing the time to first vapor whilst achieving a minimal spitting effect. The high power required to achieve the high aerosol output could be applied in short bursts first to allow the first and second compounds to rise up closer together to achieve a reduction of the vaporization ratio vr2 and therefore of the spitting effect.

For instance, and as illustrated in FIG. 4 , in this second example of embodiment the first d21, third d23 and fifth d25 durations may be equal to a chosen second value v2. But they could be different one from the other, preferably as long as the sum of the first d21, second d22, third d23, fourth d24 and fifth d25 durations remains smaller or equal to the duration of a “standard puff” (which is generally considered equal to 3 s).

Also for instance, in this second example of embodiment the chosen second value v2 may be comprised between 70 ms and 130 ms. As an illustrative example, well adapted to the case where the first and second compounds are respectively propylene glycol and vegetable glycerin/glycerol, the chosen second value v2 may be equal to 100 ms. But other second values v2 may be used, preferably as long as the sum of the first d21, second d22, third d23, fourth d24 and fifth d25 durations remains smaller or equal to the duration of a standard puff.

Also for instance, and as illustrated in FIG. 4 , in this second example of embodiment the second d22 and fourth d24 durations may be equal to a chosen third value v3. But they could be different one from the other.

For instance, this chosen third value v3 may be comprised between 10 ms and 50 ms. As an illustrative example, well adapted to the case where the first and second compounds are respectively propylene glycol and vegetable glycerin/glycerol, the chosen third value v3 may be equal to 30 ms. But other third values v3 may be used, preferably as long as the sum of the first d21, second d22, third d23, fourth d24 and fifth d25 durations remains smaller or equal to the duration of a standard puff.

In a third example of embodiment illustrated non-limitatively in FIG. 5 , the controller 27 may be arranged for controlling the supply of the heater 18 according to a chosen profile comprising a single phase p4 having a chosen duration d4 during which the electrical power ep strictly increases.

This third example of embodiment allows to control the difference in the rate of change of temperature in the first and second compounds to reduce the vaporization ratio vr3 and therefore the spitting effect. This means that it will take longer for the spitting effect to happen, but this is not a problem since the control delays the spitting effect beyond the time of a standard puff, or at the very least the spitting effect will occur for a shorter duration and will therefore be reduced.

For instance, and as illustrated in FIG. 5 , in this third example of embodiment the chosen profile may comprise a phase p4 during which the electrical power ep varies as a logarithmic function.

Also for instance, in this third example of embodiment the chosen duration d4 may be comprised between 550 ms and 650 ms. As an illustrative example, well adapted to the case where the first and second compounds are respectively propylene glycol and vegetable glycerin/glycerol, the chosen duration d4 may be equal to 600 ms. But other chosen durations d4 may be used.

It should be noticed that the invention can also be considered as a control method intended for controlling aerosol generation by the aerosol generation device 1. This control method comprises a step in which the controller 27 controls the supply of the heater 18 according to a chosen profile in which the electrical power varies over time depending on the first bp1 and second bp2 boiling points in order to control a vaporization ratio of the first and second compounds in the aerosol chamber 7.

It should be appreciated by those skilled in the art that some block diagrams of FIGS. 1 and 2 herein represent conceptual views of illustrative elements embodying the principles of the invention.

The description and drawings merely illustrate the principles of the invention. It will thus be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described or shown herein, embody the principles of the invention and are included within its spirit and scope. Furthermore, all examples recited herein are principally intended expressly to be only for pedagogical purposes to aid the reader in understanding the principles of the invention and the concepts contributed by the inventor(s) to furthering the art, and are to be construed as being without limitation to such specifically recited examples and conditions. Moreover, all statements herein reciting principles, aspects, and embodiments of the invention, as well as specific examples thereof, are intended to encompass equivalents thereof. 

1. An aerosol generation device comprising: a reservoir storing an aerosol-forming liquid comprising at least first and second mixed compounds having respectively first and second boiling points, a heater for vaporizing said aerosol-forming liquid mixed with air in an aerosol chamber to generate an aerosol, a power source storing electrical energy, and a controller arranged for controlling a supply of electrical power to said heater during each inhalation phase of a vaping session, wherein said controller is arranged for controlling said supply of electrical power according to a chosen profile in which said electrical power varies over time depending on said first and second boiling points in order to control a vaporization ratio of said first and second compounds in said aerosol chamber.
 2. The aerosol generation device according to claim 1, wherein said controller is arranged for controlling said supply of electrical power according to a chosen profile that allows minimizing said vaporization ratio of said first and second compounds in said aerosol chamber.
 3. The aerosol generation device according to claim 1, wherein said controller is arranged for controlling said supply of electrical power according to a chosen profile comprising a first phase having a first duration at a first electrical power, a second phase having a second duration at a second electrical power greater than said first electrical power, and a third phase having a third duration at a third electrical power greater than said second electrical power.
 4. The aerosol generation device according to claim 3, wherein said first, second and third durations are equal to a chosen first value.
 5. The aerosol generation device according to claim 4, wherein said chosen first value is between 150 ms and 250 ms.
 6. The aerosol generation device according to claim 1, wherein said controller is arranged for controlling said supply of electrical power according to a chosen profile comprising a first phase having a first duration at a first electrical power, a second phase having a second duration at an electrical power equal to zero, a third phase having a third duration at said first electrical power, a fourth phase having a fourth duration at an electrical power equal to zero, and a fifth phase having a fifth duration at said first electrical power.
 7. The aerosol generation device according to claim 6, wherein said first, third and fifth durations are equal to a chosen second value.
 8. The aerosol generation device according to claim 7, wherein said chosen second value is between 70 ms and 130 ms.
 9. The aerosol generation device according to claim 8, wherein said second and fourth durations are equal to a chosen third value.
 10. The aerosol generation device according to claim 9, wherein said chosen third value is between 10 ms and 50 ms.
 11. The aerosol generation device according to claim 1, wherein said controller is arranged for controlling said supply of electrical power according to a chosen profile comprising a phase having a chosen duration during which said electrical power strictly increases.
 12. The aerosol generation device according to claim 11, wherein said controller is arranged for controlling said supply of electrical power according to a chosen profile comprising a phase during which said electrical power varies as a logarithmic function.
 13. The aerosol generation device according to claim 12, wherein said chosen duration is between 550 ms and 650 ms.
 14. The aerosol generation device according to claim 1, wherein said power source is a rechargeable battery.
 15. A method for controlling aerosol generation by an aerosol generation device comprising i) a reservoir storing an aerosol-forming liquid comprising at least first and second mixed compounds having respectively first and second boiling points, ii) a heater for vaporizing said aerosol-forming liquid mixed with air in an aerosol chamber to generate an aerosol, iii) a power source storing electrical energy, and iv) a controller arranged for controlling a supply of electrical power to said heater during each inhalation phase of a vaping session, wherein the method comprises a step in which said controller controls said supply of electrical power according to a chosen profile in which said electrical power varies over time depending on said first and second boiling points in order to control a vaporization ratio of said first and second compounds into said aerosol chamber. 